<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>商品参数</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert title="注意：只允许为第三级分类设置相关参数" type="warning" show-icon :closable="false"></el-alert>
            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <el-cascader
                        expand-trigger="hover"
                        :options="cateList"
                        :props="cateProps"
                        v-model="selectedCateKeys"
                        @change="handleChange"
                    ></el-cascader>
                </el-col>
                <!-- 选择商品分类级联框 -->
            </el-row>
            <!-- tab页签区 -->
            <el-tabs v-model="activeName" type="card" @tab-click="handleTabClick">
                <el-tab-pane label="动态参数" name="many">
                    <el-button
                        type="primary"
                        size="mini"
                        :disabled="isBtnDisabled"
                        @click="addDialogVisible = true"
                    >添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template v-slot="scope">
                                <el-tag
                                    closable
                                    v-for="(item,i) in scope.row.attr_vals"
                                    :key="i"
                                    @close="handleClose(i,scope.row)"
                                >{{item }}</el-tag>
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                ></el-input>
                                <el-button
                                    v-else
                                    class="button-new-tag"
                                    size="small"
                                    @click="showInput(scope.row)"
                                >+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template v-slot="scope">
                                <el-button
                                    type="primary"
                                    icon="el-icon-edit"
                                    size="mini"
                                    @click="showEditDialog(scope.row.attr_id)"
                                >编辑</el-button>
                                <el-button
                                    type="danger"
                                    icon="el-icon-delete"
                                    size="mini"
                                    @click="removeParams(scope.row.attr_id)"
                                >删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <el-tab-pane label="静态属性" name="only">
                    <el-button
                        type="primary"
                        size="mini"
                        :disabled="isBtnDisabled"
                        @click="addDialogVisible = true"
                    >添加属性</el-button>
                    <!-- 静态属性表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template v-slot="scope">
                                <el-tag
                                    closable
                                    v-for="(item,i) in scope.row.attr_vals"
                                    :key="i"
                                    @close="handleClose(i,scope.row)"
                                >{{item }}</el-tag>
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                ></el-input>
                                <el-button
                                    v-else
                                    class="button-new-tag"
                                    size="small"
                                    @click="showInput(scope.row)"
                                >+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template v-slot="scope">
                                <el-button
                                    type="primary"
                                    icon="el-icon-edit"
                                    size="mini"
                                    @click="showEditDialog(scope.row.attr_id)"
                                >编辑</el-button>
                                <el-button
                                    type="danger"
                                    icon="el-icon-delete"
                                    size="mini"
                                    @click="removeParams(scope.row.attr_id)"
                                >删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>

        <!-- 添加参数的对话框 -->
        <el-dialog
            :title="'添加'+titleText"
            :visible.sync="addDialogVisible"
            width="30%"
            @close="addDialogClosed"
        >
            <!-- 添加参数的表单 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="80px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>

            <span slot="footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 修改参数的对话框 -->
        <el-dialog
            :title="'修改'+titleText"
            :visible.sync="editDialogVisible"
            width="30%"
            @close="editDialogClosed"
        >
            <!-- 添加参数的表单 -->
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="80px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>

            <span slot="footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            //商品分类列表
            cateList: [],
            //级联选择框的配置对象
            cateProps: {
                value: "cat_id",
                label: "cat_name",
                children: "children"
            },
            //级联选择框双向绑定到的数组
            selectedCateKeys: [],
            //被激活的页签的名称
            activeName: "many",
            //动态参数数据
            manyTableData: [],
            //静态属性数据
            onlyTableData: [],
            //控制对话框的显示和隐藏
            addDialogVisible: false,
            //添加参数的表单数据对象
            addForm: {
                attr_name: ""
            },
            //添加表单的验证规则对象
            addFormRules: {
                attr_name: [
                    { required: true, message: "请输入名称", trigger: "blur" }
                ]
            },
            //控制修改对话框的显示和隐藏
            editDialogVisible: false,
            //修改参数的表单数据对象
            editForm: {
                attr_name: ""
            },
            //修改表单的验证规则对象
            editFormRules: {
                attr_name: [
                    { required: true, message: "请输入名称", trigger: "blur" }
                ]
            }
        };
    },
    created() {
        this.getCateList();
    },
    methods: {
        //获取所有的商品分类
        async getCateList() {
            const { data: res } = await this.$http.get("categories");
            if (res.meta.status !== 200) {
                return this.$message.error("获取商品分类失败");
            }
            this.cateList = res.data;
        },
        //级联选择框选中项变化
        handleChange() {
            this.getParamsData();
        },
        //tab切换事件
        handleTabClick() {
            this.getParamsData();
        },
        //获取参数的列表数据
        async getParamsData() {
            //证明不是选中三级分类
            if (this.selectedCateKeys.length !== 3) {
                this.selectedCateKeys = [];
                this.manyTableData = [];
                this.onlyTableData = [];
                return;
            }

            //证明选中的是三级分类
            //根据所选分类的id，和当前所处的面板，获取对应的参数
            const { data: res } = await this.$http.get(
                `categories/${this.cateId}/attributes`,
                {
                    params: { sel: this.activeName }
                }
            );
            if (res.meta.status !== 200) {
                return this.$message.error("获取参数列表失败");
            }

            res.data.forEach(item => {
                item.attr_vals = item.attr_vals
                    ? item.attr_vals.split(" ")
                    : [];
                //控制文本框的显示与隐藏
                item.inputVisible = false;
                //文本框内容
                item.inputValue = "";
            });
            if (this.activeName === "many") {
                this.manyTableData = res.data;
            } else {
                this.onlyTableData = res.data;
            }
        },
        //添加参数对话框关闭事件
        addDialogClosed() {
            this.$refs.addFormRef.resetFields();
        },
        //点击确认按钮，添加参数
        addParams() {
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) {
                    return;
                }
                const { data: res } = await this.$http.post(
                    `categories/${this.cateId}/attributes`,
                    {
                        attr_name: this.addForm.attr_name,
                        attr_sel: this.activeName
                    }
                );
                if (res.meta.status !== 201) {
                    return this.$message.error("添加参数失败");
                }
                this.$message.success("添加参数成功");
                this.addDialogVisible = false;
                this.getParamsData();
            });
        },
        //点击按钮展示修改对话框
        async showEditDialog(attr_id) {
            //查询当前参数的信息
            const { data: res } = await this.$http.get(
                `categories/${this.cateId}/attributes/${attr_id}`,
                {
                    params: { attr_sel: this.activeName }
                }
            );
            if (res.meta.status !== 200) {
                return this.$message.error("获取参数信息失败");
            }
            this.editForm = res.data;
            this.editDialogVisible = true;
        },
        //重置修改的表单
        editDialogClosed() {
            this.$refs.editFormRef.resetFields();
        },
        //点击按钮修改参数信息
        editParams() {
            this.$refs.editFormRef.validate(async valid => {
                if (!valid) return;
                const { data: res } = await this.$http.put(
                    `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
                    {
                        attr_name: this.editForm.attr_name,
                        attr_sel: this.activeName
                    }
                );
                if (res.meta.status !== 200) {
                    return this.$message.error("修改失败");
                }
                this.$message.success("修改成功");
                this.getParamsData();
                this.editDialogVisible = false;
            });
        },
        //删除参数
        async removeParams(attr_id) {
            const confirmResult = await this.$confirm(
                "此操作将永久删除该参数, 是否继续?",
                "提示",
                {
                    confirmButtonText: "确定",
                    cancelButtonText: "取消",
                    type: "warning"
                }
            ).catch(err => err);

            //用户取消了删除的操作
            if (confirmResult !== "confirm") {
                return this.$message.info("已取消删除");
            }
            //删除业务逻辑
            const { data: res } = await this.$http.delete(
                `categories/${this.cateId}/attributes/${attr_id}`
            );
            if (res.meta.status !== 200) {
                return this.$message.error("删除失败");
            }
            this.$message.success("删除成功");
            this.getParamsData();
        },
        //将attr_vals的操作，保存到数据库
        async saveAttrVals(row) {
            //提交到后台
            const { data: res } = await this.$http.put(
                `categories/${this.cateId}/attributes/${row.attr_id}`,
                {
                    attr_name: row.attr_name,
                    attr_sel: row.attr_sel,
                    attr_vals: row.attr_vals.join(" ")
                }
            );
            if (res.meta.status !== 200) {
                return this.$message.error("修改参数项失败");
            }
            this.$message.success("修改参数项成功");
        },
        //文本框失去焦点或者按下回车键确认内容
        async handleInputConfirm(row) {
            if (row.inputValue.trim().length === 0) {
                row.inputValue = "";
                row.inputVisible = false;
                return;
            }
            //如果没有return，则证明输入了内容，需要做后续处理
            row.attr_vals.push(row.inputValue.trim());
            row.inputValue = "";
            row.inputVisible = false;
            //提交到后台
            this.saveAttrVals(row);
        },
        //点击按钮展示文本输入框
        showInput(row) {
            row.inputVisible = true;
            //让文本框自动获得焦点
            this.inputVisible = true;
            //$nextTick方法的作用，就是当页面上元素被重新渲染之后，
            //才会执行回调函数中的代码,防止input输入框还没渲染出来就执行了下面的代码
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        //删除标签
        handleClose(i, row) {
            row.attr_vals.splice(i, 1);
            this.saveAttrVals(row);
        }
    },
    computed: {
        //如果按钮需要被禁用，则返回true
        isBtnDisabled() {
            if (this.selectedCateKeys.length !== 3) {
                return true;
            }
            return false;
        },
        //当前选中的三级分类的id
        cateId() {
            if (this.selectedCateKeys.length === 3) {
                return this.selectedCateKeys[2];
            }
            return null;
        },
        //动态计算标题文本
        titleText() {
            if (this.activeName === "many") {
                return "动态参数";
            } else {
                return "静态属性";
            }
        }
    }
};
</script>

<style lang="less" scoped>
.cat_opt {
    margin: 15px 0;
}
.el-tag {
    margin: 5px;
}
.input-new-tag {
    width: 120px;
}
</style>